| Steree Group Limited | Administrative & support | 2016 |
| Sterling Bathrooms Ltd | Manufacturing | 2011 |
| Steve Rogers Creative Limited | Professional & scientific | 2025 |
| Stewartjm Ltd | Manufacturing | 2022 |
| Still NOT Sure Ltd | Information & communication | 2018 |
| Strategic Security Ltd | Information & communication | 2005 |
| Strategy Simulation Limited | Professional & scientific | 2012 |
| Stratton Bros Limited | Wholesale & retail | 2018 |
| Streamline Veterinary Services Ltd | Professional & scientific | 2025 |
| Strebel Limited | Wholesale & retail | 1975 |
| Streetfoodculture Limited | Wholesale & retail | 2025 |
| Strike Patches Limited | Manufacturing | 2024 |
| Strikerite Proshop Limited | Wholesale & retail | 2008 |
| Stronghold Roofing Ltd | Construction | 2023 |
| Structural & Party Wall Matters Ltd | Construction | 2016 |
| Stuart Allen Piling Ltd | Construction | 2012 |
| Stuart Perry Limited | Construction | 2002 |
| Studio Dine Ltd | Wholesale & retail | 2023 |
| Studio Iris Co (Bristol) Limited | Administrative & support | 2021 |
| Stuff by Mark Ltd | Wholesale & retail | 2023 |
| Sublatum Limited | Information & communication | 2000 |
| Succee'D School of Motoring Ltd | Education | 2015 |
| Sukhwinder Transport Ltd | Transport & logistics | 2025 |
| Sulav and Co Ltd | Professional & scientific | 2019 |
| Summer Williams Design Limited | Arts & recreation | 2012 |
| Summerswood (Rusper RD, Ifield) Management Company Ltd | Households | 2017 |
| Sun & Wang’S Property Ltd | Real estate | 2020 |
| Sun Day Life Ltd | Wholesale & retail | 2024 |
| Sun Inn Flowers Ltd | Wholesale & retail | 2020 |
| Sungold Properties Limited | Construction | 1989 |
| Sunny Future Limited | Professional & scientific | 2008 |
| Sunnyside Removals UK Limited | Other services | 2010 |
| Suntex Safety Glass Industries Limited | Professional & scientific | 1937 |
| Supaheat Ltd | Other services | 2018 |
| Super Echo Ltd | Wholesale & retail | 2017 |
| Super Pizza & Kebab Farnborough Ltd | Hospitality | 2025 |
| Super Simple Properties Ltd | Real estate | 2024 |
| SUPER6 Enterprises Limited | Extraterritorial | 2024 |
| Supercharged Consulting Limited | Professional & scientific | 2020 |
| Superdarius Ltd | Wholesale & retail | 2025 |
| Superkryo Limited | Professional & scientific | 2011 |
| Supernova Space Systems Limited | Manufacturing | 2022 |
| Supporting Access Scaffolding Ltd | Construction | 2022 |
| Supreme Being Wellness Limited | Information & communication | 2024 |
| Supreme Promotions Limited | Administrative & support | 2013 |
| Sure Point Express Ltd | Transport & logistics | 2024 |
| Surgical Management Ltd | Administrative & support | 2022 |
| Surrey Fine Arts Limited | Wholesale & retail | 2012 |
| Surrey Rolling Road Ltd. | Wholesale & retail | 2004 |
| Survey Safety & Training Ltd | Administrative & support | 2015 |
| Surya Building Solutions Ltd | Construction | 2026 |
| Sustainable Wine Roundtable Community Interest Company | Other services | 2023 |
| SVK Solutions Private Ltd | Information & communication | 2018 |
| SVS Consultancy Services Limited | Administrative & support | 2018 |
| SW Design Consultancy Ltd | Professional & scientific | 2025 |
| SW Homes & Developments Ltd | Real estate | 2020 |
| Swallow Design & Build Ltd | Construction | 2014 |
| Swallow Homes Ltd | Construction | 2015 |
| Swatt Commercial Ltd | Manufacturing | 2020 |
| Swift Water Technologies Ltd | Water & waste | 2020 |
| Swift Wheels UK Ltd | Wholesale & retail | 2024 |
| Swindon Pressings Limited | Manufacturing | 2000 |
| Switchsafe Water Treatment Ltd | Construction | 2022 |
| Switzerland Calling Ltd | Wholesale & retail | 2003 |
| SWJ Projects Ltd | Administrative & support | 2004 |
| SXD Solutions Ltd | Information & communication | 2017 |
| Sycamore Place (Farnborough) Management Limited | Real estate | 2006 |
| Sylvan Glade Management Company Ltd | Extraterritorial | 2011 |
| SYM Products Ltd | Wholesale & retail | 2026 |
| Syncopate Solutions Ltd | Information & communication | 2026 |
| Syncscience Ltd | Information & communication | 2024 |
| Syneos Health BA Limited | Administrative & support | 2020 |
| Syneos Health Holdings UK Limited | Professional & scientific | 2016 |
| Syneos Health International Holdings Limited | Professional & scientific | 1992 |
| Syneos Health IVH UK Limited | Health & social care | 1983 |
| Syneos Health UK Limited | Administrative & support | 2002 |
| Synk Consulting Limited | Information & communication | 2025 |
| Syntia AI Ltd | Professional & scientific | 2023 |
| Systematic Software Engineering Limited | Information & communication | 1992 |
| Systemic Coaching Partners Ltd | Professional & scientific | 2013 |
| Syvecs Ltd | Wholesale & retail | 2007 |
| T and D Construction and Maintenance Limited | Construction | 2018 |
| T B Intermediaries Limited | Professional & scientific | 2023 |
| T E Hayes Electrical Ltd | Construction | 2023 |
| T&H Home Maintenance Ltd | Other services | 2025 |
| T.I. Soil Ecology Laboratory Ltd | Professional & scientific | 2020 |
| T.J. Plant Limited | Administrative & support | 2000 |
| T.O.K MAB Services Ltd | Health & social care | 2014 |
| T3 Display Systems Limited | Manufacturing | 2024 |
| T3 Displays Limited | Manufacturing | 2024 |
| T3 Systems Limited | Manufacturing | 2024 |
| T4COM Limited | Information & communication | 2010 |
| T4NGO Business Services Ltd | Administrative & support | 2025 |
| T5 Global Exchanges Limited | Education | 2026 |
| T5EXCHANGES Limited | Administrative & support | 2016 |
| Tactical Support Solutions Ltd | Manufacturing | 2021 |
| TAG Aviation (UK) Limited | Transport & logistics | 1998 |
| TAG Building Co. Ltd | Construction | 2020 |
| Tagit Digital UK Ltd | Information & communication | 2024 |
| Tailormade Glass Solutions Limited | Construction | 2019 |